talkatu/talkatu

ebabd7682683
Update TalkatuMessage:id to be a string.

Many modern protocols are using uuids as id's and forcing that into a uint64 is
going to lead to collisions. So instead just use a string which should work for
everything.

Testing Done:
Ran the demo and unit tests.

Reviewed at https://reviews.imfreedom.org/r/879/
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